Astronomy chapter 3

motion around an axis passing through the rotating body

orbital motion about a point located outside the orbiting body

the apparent path of the sun around the sky

the place on the celestial sphere where the sun corsses the celestial equator moving northward. Also, the time of the year when the sun crosses this point, about march 20, and spring begins in the northern hemisphere

the point on the celestial sphere where the sun is at its most notherly point.

the point on the celestial sphere where the sun crosses the celestial equator going southward

the point on the celestial sphere where the sun is fathest south

the orbital point of closest approach to the sun

the orbital point of greatest distance from the sun

the darkening of the moon when it moves through earth's shadow

the region of a shadow that is totally shaded (pg 30)

the portion of a shadow that is only partically shaded

the period of total eclipse

the time a celestial body takes to turn once on its axis or revolve once around its orbit relative to the stars

the time a solar system body take to orbit the sun once and return to the same orbital period referenced to Earth.

for the moon, this is the time for the moon to orbit.

the even that occurs when the moon passes directly between the sun, blocking our view of the sun

the bright visible surface of the sun

bright gases just above the photosphere of the sun

on the sun, the faint outer atmosphere composed of low-density, high temperature gas

eruption on the solar surface; most visible during total solar eclipses

during a total solar eclipse, the momentary appearance of a spot of the photosphere at the edge of the moon, producing a brilliant glare set in the silvery ring of the corona

an 18 year, 11.33- day period after which the pattern of lunar and solar eclipses repeats

suggestions that Earth's climate is determined by slow periodic changes in the shape of this orbit, the angle of its axsis and precession